find mailboxes nearing quota

does anyone know of a good way to find all mailboxes nearing:

ProhibitSendQuota or IssueWarningQuota

i would like to run a script that will:

get-mailbox -ResultSize Unlimited | get-mailboxstatistics

then find all mailboxes that are about 10%\20%  away from hitting ProhibitSendQuota or IssueWarningQuota

This is to be PROACTIVE as opposed to waiting until the mailboxes hit the quotas and start firing warning or disable.

NOTE: if we can filter it to include ONLY Lithold users that would be best.